HDU 2674 N！Again

http://acm.hdu.edu.cn/showproblem.php?pid=2674

n大于等于2009时取余为0，只要算2009前面的就ok

#include <stdio.h>
#include <stdlib.h>
int main() 
{
    int n;
    int ans,i;
    while(~scanf("%d",&n))
    {
        ans=1;
        if(n>=2009)
            printf("0\n");
        else
        {
            for(i=1;i<=n;i++)    
            {
                ans*=i;
                ans%=2009;
            }
            printf("%d\n",ans);    
        }
    }
    return 0;
}